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arXiv 0903.4048astro-ph.HEastro-ph.GA
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来自大质量恒星超新星爆炸的Cosmic ray电子和正电子

Cosmic ray electrons and positrons from supernova explosions of massive stars

P. L. Biermann, J. K. Becker, A. Meli, W. Rhode, E. -S. Seo, T. Stanev

摘要:

我们把最近发现的宇宙射线电子和宇宙射线正电子过剩成分及其截止值归因于爆炸的沃尔夫-拉叶星和红超巨星极冠中超新星激波的加速。考虑到围绕这样一颗恒星的某个半径的球面,在极冠中的磁场是径向的,而在4 π(全立体角)的大部分区域中,磁场几乎是切向的。这种差异产生了更平坦的光谱,也增强了在极冠加速的宇宙射线的正电子注入。这种推理自然解释了观察结果。精确的光谱测量将是一个考验,因为它预测了源中新成分的简单E ^-2光谱,在E ^-4截止值的观测中,它会变陡到E ^-3。

英文摘要:

We attribute the recently discovered cosmic ray electron and cosmic ray positron excess components and their cutoffs to the acceleration in the supernova shock in the polar cap of exploding Wolf Rayet and Red Super Giant stars. Considering a spherical surface at some radius around such a star, the magnetic field is radial in the polar cap as opposed to most of 4 pi (the full solid angle), where the magnetic field is nearly tangential. This difference yields a flatter spectrum, and also an enhanced positron injection for the cosmic rays accelerated in the polar cap. This reasoning naturally explains the observations. Precise spectral measurements will be the test, as this predicts a simple E^-2 spectrum for the new components in the source, steepened to E^-3 in observations with an E^-4 cutoff.

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